#include<stdio.h>

int main() {
	int a = 18;
	int b = 9;
	int* x = &a;
	int* y = &b;
	int** z = &x;
	x = &b;    //内存发生改变
	z = &y;	   //内存发生改变	
	return 0;    
}	    
